netdev - Re: [PATCH v3] net: mvneta: support suspend and resume

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Date:   Thu, 16 Mar 2017 15:48:31 +0800
From:   Jisheng Zhang <jszhang@...vell.com>
To:     Jane Li <jiel@...vell.com>
CC:     <thomas.petazzoni@...e-electrons.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] net: mvneta: support suspend and resume

On Thu, 16 Mar 2017 15:11:48 +0800 Jane Li wrote:

> Add basic support for handling suspend and resume.
> 
> Signed-off-by: Jane Li <jiel@...vell.com>
> ---
> Since v2:
> - use SIMPLE_DEV_PM_OPS instead of SET_LATE_SYSTEM_SLEEP_PM_OPS
> 
> Since v1:
> - add mvneta_conf_mbus_windows() and mvneta_bm_port_init() in mvneta_resume()
> 
>  drivers/net/ethernet/marvell/mvneta.c | 60 ++++++++++++++++++++++++++++++++---
>  1 file changed, 56 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
> index 61dd446..b0fea26 100644
> --- a/drivers/net/ethernet/marvell/mvneta.c
> +++ b/drivers/net/ethernet/marvell/mvneta.c
> @@ -431,6 +431,7 @@ struct mvneta_port {
>  	/* Flags for special SoC configurations */
>  	bool neta_armada3700;
>  	u16 rx_offset_correction;
> +	const struct mbus_dram_target_info *dram_target_info;
>  };
>  
>  /* The mvneta_tx_desc and mvneta_rx_desc structures describe the
> @@ -4118,7 +4119,6 @@ static int mvneta_port_power_up(struct mvneta_port *pp, int phy_mode)
>  /* Device initialization routine */
>  static int mvneta_probe(struct platform_device *pdev)
>  {
> -	const struct mbus_dram_target_info *dram_target_info;
>  	struct resource *res;
>  	struct device_node *dn = pdev->dev.of_node;
>  	struct device_node *phy_node;
> @@ -4267,13 +4267,13 @@ static int mvneta_probe(struct platform_device *pdev)
>  
>  	pp->tx_csum_limit = tx_csum_limit;
>  
> -	dram_target_info = mv_mbus_dram_info();
> +	pp->dram_target_info = mv_mbus_dram_info();
>  	/* Armada3700 requires setting default configuration of Mbus
>  	 * windows, however without using filled mbus_dram_target_info
>  	 * structure.
>  	 */
> -	if (dram_target_info || pp->neta_armada3700)
> -		mvneta_conf_mbus_windows(pp, dram_target_info);
> +	if (pp->dram_target_info || pp->neta_armada3700)
> +		mvneta_conf_mbus_windows(pp, pp->dram_target_info);
>  
>  	pp->tx_ring_size = MVNETA_MAX_TXD;
>  	pp->rx_ring_size = MVNETA_MAX_RXD;
> @@ -4405,6 +4405,57 @@ static int mvneta_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM_SLEEP
> +static int mvneta_suspend(struct device *device)
> +{
> +	struct net_device *dev = dev_get_drvdata(device);
> +	struct mvneta_port *pp = netdev_priv(dev);
> +
> +	if (netif_running(dev))
> +		mvneta_stop(dev);
> +	netif_device_detach(dev);
> +	clk_disable_unprepare(pp->clk_bus);
> +	clk_disable_unprepare(pp->clk);
> +	return 0;
> +}
> +
> +static int mvneta_resume(struct device *device)
> +{
> +	struct platform_device *pdev = to_platform_device(device);
> +	struct net_device *dev = dev_get_drvdata(device);
> +	struct mvneta_port *pp = netdev_priv(dev);
> +	int err;
> +
> +	clk_prepare_enable(pp->clk);
> +	clk_prepare_enable(pp->clk_bus);

hmm, since clk_bus is optional, it's better to add check here.

Except the above, you could add

Reviewed-by: Jisheng Zhang <jszhang@...vell.com>

> +	if (pp->dram_target_info || pp->neta_armada3700)
> +		mvneta_conf_mbus_windows(pp, pp->dram_target_info);
> +	if (pp->bm_priv) {
> +		err = mvneta_bm_port_init(pdev, pp);
> +		if (err < 0) {
> +			dev_info(&pdev->dev, "use SW buffer management\n");
> +			pp->bm_priv = NULL;
> +		}
> +	}
> +	mvneta_defaults_set(pp);
> +	err = mvneta_port_power_up(pp, pp->phy_interface);
> +	if (err < 0) {
> +		dev_err(device, "can't power up port\n");
> +		return err;
> +	}
> +
> +	if (pp->use_inband_status)
> +		mvneta_fixed_link_update(pp, dev->phydev);
> +
> +	netif_device_attach(dev);
> +	if (netif_running(dev))
> +		mvneta_open(dev);
> +	return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(mvneta_pm_ops, mvneta_suspend, mvneta_resume);
> +
>  static const struct of_device_id mvneta_match[] = {
>  	{ .compatible = "marvell,armada-370-neta" },
>  	{ .compatible = "marvell,armada-xp-neta" },
> @@ -4419,6 +4470,7 @@ static int mvneta_remove(struct platform_device *pdev)
>  	.driver = {
>  		.name = MVNETA_DRIVER_NAME,
>  		.of_match_table = mvneta_match,
> +		.pm = &mvneta_pm_ops,
>  	},
>  };
>